Align DeepSeek and GLM execution with DS4

src/engine/metal/checkpoint.rs

@@ -302,9 +302,7 @@ impl DeepSeekExecutor {
         self.logits = logits;
         self.checkpoint_tag = checkpoint_tag;
         if let Some(dspark) = &mut self.dspark {
-            dspark.capture_mask = 0;
-            dspark.cache_start = 0;
-            dspark.cache_len = 0;
+            dspark.reset_cache();
         }
         Ok(())
     }